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diff --git a/doc/misc/rst-grammars.pl b/doc/misc/rst-grammars.pl
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+#!/usr/bin/perl
+
+# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+#
+# SPDX-License-Identifier: MPL-2.0
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, you can obtain one at https://mozilla.org/MPL/2.0/.
+#
+# See the COPYRIGHT file distributed with this work for additional
+# information regarding copyright ownership.
+
+use warnings;
+use strict;
+
+if (@ARGV < 2) {
+ print STDERR <<'END';
+usage:
+ perl docbook-options.pl options_file section > section.grammar.xml
+END
+ exit 1;
+}
+
+my $FILE = shift;
+my $SECTION = shift;
+
+open (FH, "<", $FILE) or die "Can't open $FILE";
+
+print <<END;
+.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+..
+.. SPDX-License-Identifier: MPL-2.0
+..
+.. This Source Code Form is subject to the terms of the Mozilla Public
+.. License, v. 2.0. If a copy of the MPL was not distributed with this
+.. file, you can obtain one at https://mozilla.org/MPL/2.0/.
+..
+.. See the COPYRIGHT file distributed with this work for additional
+.. information regarding copyright ownership.
+
+::
+
+END
+
+# skip preamble
+my $preamble = 0;
+while (<FH>) {
+ if (m{^\s*$}) {
+ last if $preamble > 0;
+ } else {
+ $preamble++;
+ }
+}
+
+my $display = 0;
+while (<FH>) {
+ if (m{^$SECTION\b}) {
+ $display = 1
+ }
+
+ if (m{// not.*implemented} || m{// obsolete} ||
+ m{// ancient} || m{// test.*only})
+ {
+ next;
+ }
+
+ s{ // not configured}{};
+ s{ // non-operational}{};
+ s{ // may occur multiple times}{};
+ s{[[]}{[}g;
+ s{[]]}{]}g;
+ s{ }{\t}g;
+
+ if (m{^\s*$} && $display) {
+ last;
+ }
+ if ($display) {
+ print " " . $_;
+ }
+}